Shaking or an aquarium pump provides basically perfect aeration for everything other than big beers. 8ppm. It actually is a quite controlled process since you saturate at 8ppm.

An initial aeration followed again in 8 hours provides the perfect levels for most big beers. 8ppm+8ppm = 16ppm

That's an interesting approach. I guess the premise is if the yeast need a total of 16 ppm oxygen, they gobble up the first 8 ppm and then get an additional 8 ppm later. I suppose the same approach could be used with an aeration stone and aquarium pump which also maxes out at 8 ppm. You would have to be able (or willing) to oxygenate in the fermenter with this approach as opposed to in-line oxygenation.

They're charging $180 which includes a tank, regulator, hose, and aeration stone/wand. Since the regulator only runs $48 (http://www.respondo2.com/Pediatric_O2_Regulators.html), the balance is for the tank and wand. You can probably find a cheaper used tank on Craigslist or at your local welding supply shop. Overall, I never buy new tanks (O2 or CO2) because you're going end up swapping them at a welding supply shop to get refills unless you find someone who will refill on the spot or trade you a new tank which is rare.

They're charging $180 which includes a tank, regulator, hose, and aeration stone/wand. Since the regulator only runs $48 (http://www.respondo2.com/Pediatric_O2_Regulators.html), the balance is for the tank and wand. You can probably find a cheaper used tank on Craigslist or at your local welding supply shop. Overall, I never buy new tanks (O2 or CO2) because you're going end up swapping them at a welding supply shop to get refills unless you find someone who will refill on the spot or trade you a new tank which is rare.

That looks like a medical type regulator modified to accommodate a welding cylinder. I think I'm just going to buy a medical cylinder or borrow one for brew days. Refilling it going to be a pain in the rump I think. I haven't figured that part out yet. So sick of the mini bottles from the Home Depot though...
TD

You can find cheap, used medical oxygen bottles, but will have a hard time finding a place to fill them and pay a lot more money for refills. The "short answer" is you don't need medical oxygen and tanks for oxygenating beer. You can use industrial oxygen and tanks. That's what the "red cylinders" are if you use a system like Williams Brewing sells and that's what commercial brewers use. If you want the "long answer", do a web search for the difference between medical oxygen tanks and industrial oxygen tanks (hint: it's mostly cleanliness and certification).